Pass linting test

Author: jmaillefaud

libs/core/langchain_core/messages/utils.py

@@ -939,22 +939,25 @@ def list_token_counter(messages: Sequence[BaseMessage]) -> int:
     msg = f"Unrecognized {strategy=}. Supported strategies are 'last' and 'first'."
     raise ValueError(msg)
 
+
 @overload
 def convert_to_openai_messages(
-    messages: MessageLikeRepresentation,
+    messages: BaseMessage | dict | str,
     *,
     text_format: Literal["string", "block"] = "string",
 ) -> dict: ...
 
+
 @overload
 def convert_to_openai_messages(
-    messages: Sequence[MessageLikeRepresentation],
+    messages: Sequence[BaseMessage | list[str] | tuple[str, str] | dict[str, Any]],
     *,
     text_format: Literal["string", "block"] = "string",
 ) -> list[dict]: ...
 
+
 def convert_to_openai_messages(
-    messages: Union[MessageLikeRepresentation, Sequence[MessageLikeRepresentation]],
+    messages: Union[BaseMessage, dict, str, Sequence[MessageLikeRepresentation]],
     *,
     text_format: Literal["string", "block"] = "string",
 ) -> Union[dict, list[dict]]: